ImageEngine.CreateThumbnail C# (CSharp) Method

    public Bitmap CreateThumbnail(string lcFilename, int lnWidth, int lnHeight)
    {
        System.Drawing.Bitmap bmpOut = null;
        try
        {
            Bitmap loBMP = new Bitmap(lcFilename);
            ImageFormat loFormat = loBMP.RawFormat;
            decimal lnRatio;
            int lnNewWidth = 0;
            int lnNewHeight = 0;

            //  The image has to be atleast somewhat big (Done so as to avoid icons.)
            if (loBMP.PhysicalDimension.Height < 200 && loBMP.PhysicalDimension.Width < 200)
                return null;

            if (loBMP.Height < 150 || loBMP.Width < 150)
            {
                if ((loBMP.Height < loBMP.Width / 3) || (loBMP.Width < loBMP.Height / 3))
                {
                    return null;
                }
            }

            if ((loBMP.Height < loBMP.Width / 2) || (loBMP.Width < loBMP.Height / 2))
            {
                return null;
            }

            //  If the image is smaller than a thumbnail just return it
            //if (loBMP.Width < 100 && loBMP.Height < 100)
            //    return loBMP;

            if (loBMP.Width.Equals(loBMP.Height))
                return null;

            lnNewWidth = lnWidth;
            lnNewHeight = lnHeight;

            // System.Drawing.Image imgOut = loBMP.GetThumbnailImage(lnNewWidth,lnNewHeight, null,IntPtr.Zero);

            // This code creates cleaner (though bigger) thumbnails and properly and handles GIF files better by generating a white background for transparent images (as opposed to black)

            bmpOut = new Bitmap(lnNewWidth, lnNewHeight);
            Graphics g = Graphics.FromImage(bmpOut);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight);
            g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight);
            loBMP.Dispose();
        }
        catch (Exception ex)
        {
            return null;
        }
        return bmpOut;
    }